EP1986077B1 - Display device and electronic apparatus - Google Patents

Display device and electronic apparatus Download PDF

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Publication number
EP1986077B1
EP1986077B1 EP08154278.9A EP08154278A EP1986077B1 EP 1986077 B1 EP1986077 B1 EP 1986077B1 EP 08154278 A EP08154278 A EP 08154278A EP 1986077 B1 EP1986077 B1 EP 1986077B1
Authority
EP
European Patent Office
Prior art keywords
heat dissipation
display device
cover
liquid crystal
frame
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP08154278.9A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1986077A1 (en
Inventor
Masaya Takayanagi
Masuo Ohnishi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Publication of EP1986077A1 publication Critical patent/EP1986077A1/en
Application granted granted Critical
Publication of EP1986077B1 publication Critical patent/EP1986077B1/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/20—Cooling means
    • G06F1/203—Cooling means for portable computers, e.g. for laptops

Definitions

  • the present invention relates to a display device that displays image, and an electronic apparatus including the same.
  • a portable image display device for displaying image has used a liquid crystal module having a liquid crystal panel.
  • liquid crystal modules have employed a system, a so-called “edge light” that includes, on the back side of a liquid crystal panel, a member called “light guiding plate” for directing light from a light source received on a side face from a front face toward the liquid crystal panel.
  • the liquid crystal module of the edge light system includes: a liquid crystal panel; a light irradiation section that includes a cold cathode tube or the light guiding plate described above as a light source that irradiates the liquid crystal panel with light; a frame that integrally holds the liquid crystal panel and the light irradiation section; and a control substrate on which an inverter for supplying power to the light source is implemented.
  • the liquid crystal module of the edge light system recently, has been also increasingly required to be more lightweight and thinner, and to have a longer service life, and some approaches considering these requirements have been proposed (see, for example, Japanese Patent Application Publication No. 2001-249621 ).
  • LED light emitting diode
  • an LED has problems of poor resistance to heat and a short service life when exposed to heat.
  • the problems described above are not limited to a liquid crystal panel but lie in a display panel requiring light irradiation from a light source for displaying image, and also will arise not only in the LED, but in a light source that can be made more lightweight and thinner, but has poor resistance to heat.
  • JP 2007 096240 A , US 2005/180142 A1 , US 2001/043461 A1 and US 2004/264130 A1 show light emitting devices with LEDs and elements for conducting heat form the LEDs.
  • US 2002/0163791 A1 shows a backlight system comprising at least two light-emitting panels having a front wall, an opposing rear wall and opposite edge surfaces associated with clusters of red and blue or red and green LEDs on a printed circuit board having a metal core.
  • the present invention has been made in view of the above circumstances and provides a display device that can be made more lightweight and thinner, and concurrently have a longer service life, and an electronic apparatus including the display device.
  • a display device according to the present invention is defined in the claims.
  • the display device of the present invention heat generated by the light source is transferred from the frame that holds the light source to the heat sink, and further from the heat sink to the cover through the heat dissipation component. Accordingly, the display device of the present invention allows the light source not to be exposed to heat and can contribute to prolonging a service life of the light source.
  • the display device further includes a second heat dissipation component provided in the cover and being in contact with an end portion of the side of the frame extending in the width direction of the display panel.
  • the cover may include a front cover and a back cover that accommodate the frame, and the heat dissipation component may be provided in the back cover.
  • the display device according to the present invention further includes a reinforcing component provided between the cover and the heat dissipation component.
  • the reinforcing component provided in the cover can suppress occurrence of severe bending in a portion of the cover to which pressure is applied even when the cover partially undergoes the pressure, and the frame and the display panel in the cover can be prevented from being damaged. Also, the reinforcing component is made, for example, of metal, and heat transfer from the frame to the cover can be further accelerated.
  • the reinforcing component includes:
  • the reinforcing component includes the first portion and the second portion extending in a direction perpendicular to the first portion, the reinforcing component is more strengthened, which can surely protect the frame and the display panel from a partial pressure applied to the cover.
  • the heat dissipation component is made of heat dissipation rubber.
  • the heat dissipation component is made of heat dissipation rubber, it is possible to protect the display panel from an impact applied to the cover.
  • An electronic apparatus includes:
  • the present invention it is possible to provide a display device that can be made more lightweight and thinner, and concurrently have a longer service life, and an electronic apparatus including the display device.
  • Figs. 1 and 2 are outline views of one embodiment of an electronic apparatus of the present invention including one embodiment of a display device of the present invention.
  • a computer 1 of one embodiment of the electronic apparatus of the present invention is a so-called "Notebook PC" in which an image display device 2 (one embodiment of the display device of the present invention) having a liquid crystal panel 21 for displaying image and a main device 3 having a circuit board therein and a keyboard arranged on an upper surface thereof are openably and closably linked to each other through a hinge member 10.
  • an image display device 2 one embodiment of the display device of the present invention
  • main device 3 having a circuit board therein and a keyboard arranged on an upper surface thereof are openably and closably linked to each other through a hinge member 10.
  • Fig. 1 shows that the image display device 2 is closed and overlaid on the main device 3
  • Fig. 2 shows that the image display device 2 is opened with respect to the main device 3.
  • the main device 3 shown in Fig. 2 includes: a keyboard 36 in which multiple keys are arranged; an operation section 37 including a track pad and click buttons; an upper cover 31 molded so as to keep away from a portion into which the keyboard 36 and the operation section 37 are fitted; a lower cover 32 for forming a housing of the main device 3 along with the upper cover 31; and the circuit board contained in the housing, on which a CPU executing a program is installed.
  • the image display device 2 shown in Fig. 2 includes: a liquid crystal module including the liquid crystal panel 21 for displaying image; a front cover 201 for covering the circumference of the liquid crystal panel 21; and a back cover 202 (see Fig. 1 ) for accommodating the liquid crystal module and forming a housing of the image display device 2 along with the front cover 201.
  • the covers for forming the housings are made of resin.
  • the liquid crystal module includes: the liquid crystal panel 21; a light irradiation section for irradiating the liquid crystal panel 21 with light and including an LED as a light source; a metal frame for integrally holding the liquid crystal panel 21 and the light irradiation section; and a control board on which the circuit board for controlling emission of the LED is implemented.
  • the liquid crystal panel 21 is generally formed by laminating a polarizing filter (vertical) 211 (see Fig. 3 ), a glass plate, liquid crystal sandwiched by transparent electrodes, a glass plate and a polarizing filter (horizontal) in this order from the front face side.
  • the light irradiation section includes: an LED; a light guiding plate situated on the back side of the liquid crystal panel 21; and a reflecting plate situated on the reverse face side of the light guiding plate, for receiving irradiated light from the LED by a side face and reflecting it to the front face side.
  • the liquid crystal module 20 is of a type of the so-called "edge light system”.
  • Fig. 3 shows the image display device whose front cover is removed.
  • Fig. 3 shows the image display device 2 when the front cover 201 is removed that covers both of a rim portion of the polarizing filter 211 situated in the front of the liquid crystal panel 21 and a metal frame 23 for integrally holding the liquid crystal panel 21 and the light irradiation section.
  • Fig. 3 shows that a cable 100 is connected to a control board 24 on which a circuit board 241 is implemented, and which composes the liquid crystal module together with other elements such as the liquid crystal panel 21 and the metal frame 23.
  • a miniature camera unit, a microphone unit and further, wiring attached thereto and the like are actually arranged around the liquid crystal module, but are not shown in Fig. 3 .
  • Fig. 4 is a back view of the liquid crystal module.
  • Fig. 4 shows the liquid crystal module 20 seen from the backside while Fig. 3 showing the liquid crystal module 20 seen from the front side.
  • Fig. 4 shows a reflecting plate 223 situated at the rearmost position among the components of the light irradiation section situated on the backside of the liquid crystal panel 21.
  • Fig. 4 also shows that a flexible cable 220 extends from each of both ends of the metal frame 23 lying below in Fig. 4 .
  • the flexible cable 220 has an LED 221 (see Fig. 6 ) installed thereon, and actually, the flexible cable 220 runs inside the metal frame 23 and is connected to the control board 24.
  • Fig. 4 shows that a heat dissipation plate 25 indicated by slanted lines is attached to a lower, central portion of the metal frame 23 in Fig. 4 .
  • the heat dissipation plate 25 corresponds to one example of the heat sink according to the present invention.
  • Fig. 5 shows the metal frame.
  • Fig. 5 shows the metal frame 23 in the liquid crystal module 20 whose back side is shown in Fig. 4 , and here, shows also the flexible cables 220 extending from right-and-left lower ends of the metal frame 23.
  • Fig. 6 is an elevation view of the metal frame.
  • Fig. 6 shows the metal frame 23 seen from the front side while Fig. 5 showing the metal frame 23 seen from the back side, and here, shows a part of multiple LEDs 221 installed on the flexible cable 220 running inside the metal frame 23.
  • Fig. 7 is an enlarged view of the heat dissipation plate.
  • Fig. 7 shows, in the enlarged view, the heat dissipation plate 25 in the liquid crystal module 20 whose back face is shown in Fig. 4 , and only an upper half of the heat dissipation plate 25 shown in Fig. 7 is attached to the metal frame 23.
  • Fig. 8 shows the inside of the back cover.
  • Fig. 8 shows a state in that the liquid crystal module 20 is removed from the state shown in Fig. 3 , and here, shows that the inside of the back cover 202 is exposed.
  • Fig. 8 shows that a first heat dissipation rubber 26 is arranged at a position where the first heat dissipation rubber 26 is in contact with the heat dissipation plate 25 shown in Fig. 4 and attached to the metal frame 23 of the liquid crystal module 20.
  • the first heat dissipation rubber 26 has a width in contact with a portion where the heat dissipation plate 25 protrudes from the metal frame 23, and has the same length as that in the longitudinal direction of the heat dissipation plate 25.
  • the first heat dissipation rubber 26 corresponds to one example of the heat dissipation component according to the present invention.
  • the heat dissipation plate 25 is attached to the metal frame 23. Accordingly, heat in the metal frame 23 is at least conducted to the heat dissipation plate 25, and heat can be dissipated from the metal frame 23.
  • the first heat dissipation rubber 26 is in contact with the heat dissipation plate 25 except for the portion where the heat dissipation plate 25 is attached to the metal frame 23 is provided on the back cover 202 side. Accordingly, heat generated from the LED 221 can be more dissipated through the metal frame 23. As described above, the first heat dissipation rubber 26 is provided to keep away from the portion where the heat dissipation plate 25 is attached to the metal frame 23.
  • Fig. 8 shows second heat dissipation rubbers 27 provided in a different step from the first heat dissipation rubber 26 so as to be in contact with the metal frame 23 on both sides of the first heat dissipation rubber 26.
  • the second heat dissipation rubber 27 corresponds to one example of the second heat dissipation component according to the present invention.
  • the metal frame 23 when the liquid crystal module 20 is accommodated in the back cover 202, the metal frame 23 is in contact with the second heat dissipation rubber 27, and accordingly, heat in the metal frame 23 is conducted to the first heat dissipation rubber 26 through the heat dissipation plate 25, and the second heat dissipation rubber 27 also prevents the heat in the metal frame 23 from persisting therein.
  • Fig. 8 shows a reinforcing plate 28 onto which upper surface the first heat dissipation rubber 26 and the second heat dissipation rubber 27 are attached, and whose lower surface is fixed to the back cover 202.
  • the reinforcing plate 28 is a metal, L-shaped plate including a fixed section 280 fixed to the back cover 202 and a rising section 281 rising from the fixed section 280.
  • the reinforcing plate 28 is used to prevent the liquid crystal panel 21 from being damaged due to bending of the back cover 202 caused by a local pressure applied to the back cover 202.
  • the first heat dissipation rubber 26 and the second heat dissipation rubber 27 are attached to the reinforcing plate 28 made of metal, and heat in the metal frame 23 is conducted up to the reinforcing plate 28. This also prevents the heat in the metal frame 23 from persisting therein.
  • the embodiment described above has been described referring to the example in which the back cover has had rubber for heat dissipation provided thereon, but any material except for the rubber may be used if it has performance of heat dissipation.
  • the description has been provided referring to the example in which the reinforcing plate has been the L-shaped plate, but the shape thereof may be an inverse T-shaped if the reinforcing plate includes a first portion extending in a direction parallel to the surface of the back cover and a second portion extending in a direction perpendicular to the first portion.
  • the metal frame 23 and the heat dissipation plate 25 have been separate components, but these may be integrally formed.
  • Fig. 9 shows a modification in which a highly heat-transferable sheet is attached onto the reinforcing plate.
  • Fig. 9 shows that the highly heat-transferable sheet 29 is attached onto the reinforcing plate 28 to prevent the heat in the metal frame 23 from persisting therein, in contrast with the example shown in Fig. 8 .
  • the heat in the metal frame 23 can be further prevented from persisting therein.
  • Fig. 10 shows another modification in which a length of the heat dissipation plate according to the present embodiment is extended.
  • Fig. 10 shows that when the length of the heat dissipation plate 25 shown in Fig. 7 is extended, the lengths of the first heat dissipation rubber 26 and the reinforcing plate 28 are also extended according to the extended length of the heat dissipation plate 25. As compared to the example shown in Fig. 7 , the heat in the metal frame 23 can be also further prevented from persisting therein.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Nonlinear Science (AREA)
  • Liquid Crystal (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
EP08154278.9A 2007-04-23 2008-04-09 Display device and electronic apparatus Expired - Fee Related EP1986077B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007113090A JP4572212B2 (ja) 2007-04-23 2007-04-23 表示装置および電子機器

Publications (2)

Publication Number Publication Date
EP1986077A1 EP1986077A1 (en) 2008-10-29
EP1986077B1 true EP1986077B1 (en) 2018-08-01

Family

ID=39629007

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08154278.9A Expired - Fee Related EP1986077B1 (en) 2007-04-23 2008-04-09 Display device and electronic apparatus

Country Status (6)

Country Link
US (1) US7679903B2 (zh)
EP (1) EP1986077B1 (zh)
JP (1) JP4572212B2 (zh)
KR (1) KR100967134B1 (zh)
CN (1) CN101295085B (zh)
TW (1) TWI372021B (zh)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI488574B (zh) 2011-07-18 2015-06-11 Au Optronics Corp 散熱結構及可攜式摺疊電子裝置
US9357677B2 (en) 2012-09-26 2016-05-31 Panasonic Intellectual Property Management Co., Ltd. Electronic device with efficient heat radiation structure for electronic components
TWI498716B (zh) * 2013-02-22 2015-09-01 Wistron Corp 電子裝置

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JPH08262440A (ja) 1995-03-22 1996-10-11 Casio Comput Co Ltd 液晶表示装置
US5606341A (en) * 1995-10-02 1997-02-25 Ncr Corporation Passive CPU cooling and LCD heating for a laptop computer
US6330148B1 (en) * 1999-01-13 2001-12-11 Lg. Philips Lcd Co., Ltd. Flat panel display module for computer
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JP4356355B2 (ja) * 2003-05-02 2009-11-04 ソニー株式会社 液晶表示装置及びこれを備えた電子機器
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Also Published As

Publication number Publication date
CN101295085A (zh) 2008-10-29
CN101295085B (zh) 2010-11-10
KR100967134B1 (ko) 2010-07-05
JP2008268655A (ja) 2008-11-06
KR20080095178A (ko) 2008-10-28
US7679903B2 (en) 2010-03-16
US20080259568A1 (en) 2008-10-23
TW200845882A (en) 2008-11-16
JP4572212B2 (ja) 2010-11-04
EP1986077A1 (en) 2008-10-29
TWI372021B (en) 2012-09-01

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